crypto_has_ahash(9)

💅 crypto_has_ahash — bestie, is this ahash even there?

okay so welcome to the Kernel API Manual entry for crypto_has_ahash, and yes we are absolutely getting into it 💖

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✨ NAME ✨

crypto_has_ahash — the little vibe check that tells you whether an ahash exists at all 🔍

Like, it literally just searches for the availability of an ahash. That's the whole job. Iconic, honestly.

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🌸 SYNOPSIS 🌸

int crypto_has_ahash (const char *alg_name , u32 type , u32 mask );

three arguments, one int out the door, no drama 🎀

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🦋 ARGUMENTS 🦋

• alg_name — this is the cra_name / name, or the cra_driver_name / driver name, of the ahash you're asking about 💫 so you can slide in with the friendly name or the full government driver name, both work.
• type — specifies the type of the ahash. yeah. that's the whole description. it's giving mysterious but okay 👑
• mask — specifies the mask for the ahash. and that's it, that's the tea 🍵

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🔥 RETURN 🔥

• returns true when the ahash is known to the kernel crypto API ✅
• returns false otherwise ❌

no cap, that's the entire contract. either it's in the API or it's not, and now you know 🙌

heads up bestie: the signature says int but the return section talks about true / false — that's just how the page tells it, so don't come for me about it 😭

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💜 SEE ALSO 💜

okay this list is LONG, like, scroll-for-a-while long, but every single one of them is here because I would never do you dirty like that 🫶

• Kernel file ./include/crypto/hash.h — the home base 🏠
• Message Digest Algorithm Definitions(9)
• struct ahash_alg(9)
• struct shash_alg(9)
• Asynchronous Message Digest API(9)
• crypto_alloc_ahash(9)
• crypto_free_ahash(9)
• crypto_ahash_blocksize(9)
• crypto_ahash_digestsize(9)
• crypto_ahash_statesize(9)
• crypto_ahash_reqtfm(9)
• crypto_ahash_reqsize(9)
• crypto_ahash_setkey(9)
• crypto_ahash_finup(9)
• crypto_ahash_final(9)
• crypto_ahash_digest(9)
• crypto_ahash_export(9)
• crypto_ahash_import(9)
• crypto_ahash_init(9)
• crypto_ahash_update(9)
• Asynchronous Hash Request Handle(9)
• ahash_request_set_tfm(9)
• ahash_request_alloc(9)
• ahash_request_free(9)
• ahash_request_set_callback(9)
• ahash_request_set_crypt(9)
• ahash_request_set_virt(9)
• Synchronous Message Digest API(9)
• crypto_alloc_shash(9)
• crypto_free_shash(9)
• crypto_shash_blocksize(9)
• crypto_shash_digestsize(9)
• crypto_shash_descsize(9)
• crypto_shash_setkey(9)
• crypto_shash_digest(9)
• crypto_shash_tfm_digest(9)
• crypto_shash_export(9)
• crypto_shash_import(9)
• crypto_shash_init(9)
• crypto_shash_finup(9)
• crypto_shash_update(9)
• crypto_shash_final(9)

like half of these are the async ahash girlies and the other half are the sync shash girlies and honestly both ate 💅

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✨ that's the whole page, bestie ✨

this lil masterpiece lives under ./include/crypto in the source tree, dated October 2026, and it's filed as crypto_has_ahash(9) — go forth and check your hashes, ily, bye 🎀💖🧚